Did some datalogging: a cookie for the first one to identify a problem

Took the car out to do some datalogging yesterday.

I think this says everything:

BTW, car funs fine after clearing codes. It went into a no boost mode that made it run like crap and scared me to death! Code cleared and she seems to be as good as ever. Good thing I was relatively quick with clutching back in!

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2009 335i: PROcede V4 with BMS DCI (still not sure how they get along!)

Yikes, glad you got away with your mistake without any serious issues, including your personal safety.

Thanks. I was definitely shifting fast and put a bit too much pull into the 3-4 shift. I'm a little surprised it was that easy to get into 2nd, usually there is some resistance in the tranny/synchros to that sort of thing. The car never broke traction or anything. Just got a 1/2 engine limp (no boost) mode. I could see this on the procede fuel boost gauge.

I cleared the codes and all seems to be well. I got very lucky!

2009 335i: PROcede V4 with BMS DCI (still not sure how they get along!)

Even if you didn't break a spring you might have weakened them... could be a ticking time bomb.

I'm still amazed you hit that rpm.

I'm amazed too.

I'm not sure why that would damage the valve springs. I mean the valve lift is the same, just lots faster. The main thing I was worried about was the reciprocating parts (pistons, rods) and rotating parts (timing chain) from the heavy acceleration loads.

The main concern with the valves would be that they would float and hit the pistons. I'm pretty sure that didn't happen given how strong the car is running. I got lucky. I hope nothing happens long term!

2009 335i: PROcede V4 with BMS DCI (still not sure how they get along!)

I'm not sure why that would damage the valve springs. I mean the valve lift is the same, just lots faster. The main thing I was worried about was the reciprocating parts (pistons, rods) and rotating parts (timing chain) from the heavy acceleration loads.

Well, you can weaken the valve springs by pushing them out of range which you did. I wouldn't be as worried about the pistons or rods, if something happened with those, you would already know. The spring can be weakened though by exceeding the limiter as well as hitting it.

I think you got lucky too and hope nothing happens as well. If it does, well, you know what did it

The bad news is the DME records maximum RPM in a space we can't erase. Same for maximum boost (if you're flash tuned). So be careful with any future serious warranty claim.

I think I knew about the maximum rpm. Yeah, that will be a tough one if anything does happen. fingers crossed!

I didn't know it records maximum boost! That seems like a huge liability for the guys running flash tunes! If you can't erase it you're going to get your warranty claims denied all the time even if you reflash to stock.

2009 335i: PROcede V4 with BMS DCI (still not sure how they get along!)

I think I knew about the maximum rpm. Yeah, that will be a tough one if anything does happen. fingers crossed!

I didn't know it records maximum boost! That seems like a huge liability for the guys running flash tunes! If you can't erase it you're going to get your warranty claims denied all the time even if you reflash to stock.

I think people who flash generally accept they're not going to be able to make any serious warranty claims. And rightfully so. When you take those steps it's really on you to cover things should they go bad. But on the plus side that information is not easy to get and not likely to be pulled for your basic oil change or fuel pump replacement.

I think people who flash generally accept they're not going to be able to make any serious warranty claims. And rightfully so. When you take those steps it's really on you to cover things should they go bad. But on the plus side that information is not easy to get and not likely to be pulled for your basic oil change or fuel pump replacement.